I was inspired to write this after reading this months Powerslam.
In answering a readers question over whether Bret Hart and Hulk Hogan ever faced off in WCW the answer was, they fought to a no contest on Nitro in '98 and to 3 no contests on house shows, how the hell did they miss out on this feud.
I realise when he came in it was the same time as the climax (blown climax) of the Hogan vs. Sting feud but surely the next big build should have been Bret Hart vs. Hulk Hogan, that is a massive feud.
Its a shame these guys never got that "Big" match. They had a chance in 1993 in WWF, Hogan was meant to put Bret over at King of the Ring (pass the torch so to speak), but he said Bret was ready and did the job to the awful Yokozuna instead.
Another that comes to mind is Flair vs. Hogan in WWF. When Flair was signed the chance was golden, the 2 even feuded for a while, Flair cost Hogan his title, but post Flair's title win they switched things and Flair battled Savage at Wrestlemania instead, that match should have been Flair vs. Hogan, I understand they met once at a house show (which is on a recent WWE DVD that I intend to pick up) but this feud at that time would have been fantastic, especially since Flair had originally shown up wearing the WCW Heavyweight Title.
Another obvious one is Hogan vs. Austin, obviously.